package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOPeration{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书!");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的图书:");
        String name = scanner.nextLine();

        int pos = -1;

        int currentSize = bookList.getUsedSize();
        int i = 0;
        for(; i < currentSize; i++)
        {
            Book book = bookList.getBook(i);
            if(book.getName().equals(name))
            {
                pos = i;
                break;
            }
        }

        if(i == currentSize)
        {
            System.out.println("没有你要删除的图书");
            return;
        }

        int j = pos;
        for(; j < currentSize - 1; j++)
        {
            Book book = bookList.getBook(j + 1);
            bookList.setBooks(book, j);
        }

        bookList.setBooks(null, j);
        bookList.setUsedSize(currentSize - 1);
    }
}
